Fuel mixing device



0ct.'27,1931. I GWMCKEE azamz FUEL MIXING DEVICE Filed Feb. 26, 1927 2 Sheets-Sheet l inueraz o'fl car/zea Get. 27, 1931. G. w. M KEE 1,829,102

FUEL MIXING DEVICE Filed Feb. 26, 1927 2 Sheets-Sheet 2 m GZZfIt Z 7166 Patented Oct. 27, 1931 UNITED STATES PATENT OFFICE FUEL MIXING DEVICE Application filed February 26, 1927. Serial No. 171,333.

In order to overcome these heretofore prevailing disadvantages in fuel mixers, I have designed a device capable of accurately mixing gas and air as desired and whose parts are locked in their adjusted positions, and

having means for preventing gas leakage.

One of the objects, therefore, of this invention is to provide a regulatable fuel mixer for mixing gas and air in various deslred proportions and which is so adapted that 5 its adjustable parts are locked in operative position.

Another object of this invention is to provide in a fuel mixing device means for preventing gas leakage.

Another object of this invention is to provide a fuel mixing device having the above desirable characteristics, of sturdy constructions, and being so simple in design that it may be manufactured economically and be made available to the public at a low cost.

In the drawings, in which I have illustrated a preferred embodiment of my invention,

Fig. 1 is an end elevation of the fuel mixer with a portion of the air regulator or shutter broken away;

Fig. 2 is a vertical longitudinal section of a portion of the fuel mixing device taken on the line 2-2 of Fig. 1;

Fig. 3 is a vertical transverse section taken on the line 33 of Fig. 2; and

Fig. 4 is a vertical longitudinal central sectional view of the entire fuel mixing device.

Referring now in greater detail to the drawings, a casing 1 having an open end 2 and an open end 3 forms a chamber generally indicated as 4 in which is arranged an upstanding gas intake member 5. The outer end 6 of the member 5 is furnished with internal threads 7 for attachment to a source of gas supply. Other means, of course, may be utilized for connecting the end 6 to the gas supply. One wall of the member 5 is provided with a port 8 into which is threaded a perforated plug 9. The plug, or jet, as it is commonly known, is provided with a tapered seat 10 and an opening 11. Gas entering through the open end 6 of the member 5, under pressure, is allowed to pass along the sides of the needle 12 out through the port 11.

The needle 12 is connected to a screw 13 which is capable of being advanced and withdrawn within the project-ing guide member 14 on the gas intake member 5. The screw 13 has a kerf 15 to which may be applied a screw driver for rotating the screw 13 to advance or retard the needle.

A shutter 16 having internal threads cooperating with the external threads on the member 14 may be advanced toward or away from the open end 2 of the chamber 4, the position of the shutter thus serving to regulate the aperture through which air may be drawn into the chamber 4. It is desirable that the shutter 16 be capable of being locked in position so that an adjustment once determined and made may be permanent, despite the presence of vibration in the structure. Accordingly, I provide a cap 17 having internal threads cooperating with the external threads on the member 14 and having a forward end 18 which abuts against the shutter 16 and locks the shutter by a clamping action exerted upon the threads of the member 14. The cap 17 also serves to close the open end of the member 14, keeping that end free from accumulations of foreign matter and discouraging unnecessary tampering with the adjustment of the needle.

In order that this device, through long continued use, may not become liable to leak gas, I provide in the member 14 a channel 19 which entirely surrounds the circumference of the needle, as illustrated in Figs. 2 and 3.

At one or more points, I provide a passage 20 extending from the channel 19 into the chamber 4.

the threads of the screw 13 become worn, there will ordinarily be a tendencyfor gas:

to creep back along the threads toward the rear end of the member 14. If this gas should escape outside of the mixer, it might cause some annoyance due to the odor or there might even be some danger under certain circumstances. The gas escaping through the port 11, meanwhile, is entraining air past the perimetral edges of the shutter and 1s efiecting a considerable reduction of pressure below atmospheric pressure within the chamber 4. It is obvious then that any gas creeplng back along the threads of the screw 13 will be picked up bythe channel 19 and w1thdrawn through the channel 20 into the chamber 4 and thence carried into the mixture, without any resulting harmful effects. The cap 17, cooperating with the external threads on the member 14 tends'to seal the outer open end of the member 14 and thus aid the channel 19 in picking up all of the rearwardly escaping gas. r

A Venturi tube 21 is connected to the open end 3 of the casing 1 and constitutes the passage in which the projected stream of gas from the port 11 mixes with the entrained air entering past the shutter 16 into the open end 2 of the chamber 4. The casing and Ventur1 tube may be connected as by the coo erating threads 22, while the other end of the entur1 tube is provided with means such as the threads 23 for connecting the entire device to the conduit leading to the place where the mixture of gas and air is to e used.

This device is so designed that jets 9 of various sizes may easily be inserted into the.

port 8 in the gas intake member 5 and regulating needles of corresponding sizes may ac cordingly be inserted through the member 14 to seat in their respectively correspondin jets. The gas pick up channel 19 will, of course, always be ready for instant service and will require no attention.

It should be understood that the illustrated embodiment of my invention is subject to considerable modification and change without. departing from the spirit and scope of my invention. I

I claim:

1. In a fuel mixing device, a casing having a chamber, a gas intake conduit having a port in one wall thereof, means extending through a wall of said conduit to the exterior of the casing for regulating gas flow through said port, a guide member for said means having a chamber through which the regulating means extends for collecting any leaking gas which may be flowing alongside said means toward the exterior of the casing, means for admitting an air stream into said casing chamber, and a duct leading from the guide member chamber into proximity with said air stream whereby said vstream will draw from the duct and guide member chamber accumulations of leaking gas.

2. In a fuel mixing device, a casing forming a chamber, a gas intake conduit having an inlet port and an outlet port, a needle valve extending through a wall of said conduit from the exterior of the casing for regulating said outlet port, a guide member for said needle having means for collecting any gas which may be leaking alongside said needle, a duct leading from said means into said chamber, and means for admitting a stream of air into said chamber past the opening of said duct for drawing gas from the duct into the chamber.

3. In a fuel mixing device, a casing, a gas inlet conduit having a gas inlet port and a gas discharge port, movable means extending to the exterior of the casing for regulating the gas flow through said discharge port, means for guiding the movement of the gas control means, and means in communication with the interior surface of the guide means and the exit sideof said port discharge for conducting gas leakage from said. guide means into said casing. I

4. In a fuel mixing device, a casing, a gas intake conduit in said casing having an inlet port and an outlet port, means controllable from the exterior of said casing for regulating the flow of gas through said outlet port,

. a chamber for collecting any gas which may leak alongside said regulating means toward the exterior of the casing, and means for admitting into said casing an air stream entrained by said gas discharged from said outlet port, said chamber having communication with said air stream whereby the air stream exhausts from the chamber anygas collected therein. 7 i

5. In a fuel mixing device, a casing, -means g for conducting gas into said casing, means extending to the exterior of the casing for regulating the flow of said gas into the casing, means for regulatably admitting into said casing an air stream entrained by the gas flowing into said casing, and means for conducting into said air stream any gas leakage which may fiow alongside the gas regulating means toward the exterior of the casmg. 1 I

6. In a fuel mixing device, a casing, a gas conduit having a discharge port for admitting gas into said casing, movable means for regulating the flow of gas through said discharge port, a chamber for collecting any gas which may leak toward-the exterior of 'the asaaioa casing alongside said gas regulating means, said chamber having an outlet into said casing, said casing having an outlet toward which the gas flows from said discharge port, the outward fiow of said gas from said casing being adapted to create a lower pressure in the vicinity of said collecting chamber outlet than exists in the gas which leaks alongside said regulating means toward said collecting chamber to thereby collect and conduct into said casing said gas leakage.

7. In a fuel mixing device, a casing having a gas inlet conduit, said conduit having a gas out-let port, means controllable exteriorly of the casing for regulating the flow of gas through said port, and a passage pneumatically controlled by said flow of gas through said port for conducting back into the gas emerging from the port any gas which may be tending to leak outwardly of the casing from said gas conduit alongside said gas controlling means.

8. In a fuel mixing device, a casing, a gas inlet conduit having a gas outlet port, mov= able means controllable exteriorly of the casing for regulating the flow of a gas stream through said port, and a gas leakage collecting chamber alongside said gas control means communicating with the interior of said casing for collecting gas escaping from said conduit alongside said control means, said gas port being positioned for projecting gas into the casing in such a manner and direction as to produce a lower fluid pressure in the casing adjacent its communication with said chamber than the pressure existing in, said conduit when the gas is being discharged under pressure whereby said gas leakage in said chamber may be induced pneumatically to flow through the casing and rejoin the gas emerging from said port.

9. In a fuel mixing device, a casing having a gas inlet conduit having a discharge port, means for regulating said port extending through a wall of said conduit, the flow of gas through said port being adapted to establish a lower gas pressure on the exit side of the port than exists in said conduit, means for collect-ing gas leakage tending to escape outwardly from the conduit alongside said control means, and an air inlet in said casing through which an air stream is entrained by the gas discharged from said port, said air stream being adapted to cooperate with said collecting means to return said gas leakage to the gas emerging from said port.

10. In a device for controlling the flow of a fluid, a conduit for conducting the fluid under pressure having an inlet port and an outlet port, a valve for regulating said outlet port having a movable stem extending through a wall of said conduit for moving said valve, and a passage having one end positioned for collecting fluid leakage about said stem Where the latter passes through nature.

GARNET W. Moi FEE. 

